SELECT 
  company_descriptions.*, 
  companies.*, 
  vendor_plan_descriptions.plan, 
  seo_names.name as seo_name, 
  seo_names.path as seo_path, 
  vendor_ga_tracking_code, 
  vendor_fb_tracking_code, 
  AVG(discussion_rating.rating_value) AS average_rating, 
  CONCAT(
    companies.company_id, 
    '_', 
    IF (
      discussion_rating.thread_id, discussion_rating.thread_id, 
      '0'
    )
  ) AS company_thread_ids 
FROM 
  companies AS companies 
  LEFT JOIN company_descriptions AS company_descriptions ON company_descriptions.company_id = companies.company_id 
  AND company_descriptions.lang_code = 'en' 
  LEFT JOIN vendor_plan_descriptions ON companies.plan_id = vendor_plan_descriptions.plan_id 
  AND vendor_plan_descriptions.lang_code = 'en' 
  LEFT JOIN seo_names ON seo_names.object_id = 473 
  AND seo_names.type = 'm' 
  AND seo_names.dispatch = '' 
  AND seo_names.lang_code = 'en' 
  LEFT JOIN discussion as discussionA ON discussionA.object_id = companies.company_id 
  AND discussionA.object_type = 'M' 
  LEFT JOIN discussion_posts ON discussion_posts.thread_id = discussionA.thread_id 
  AND discussion_posts.status = 'A' 
  LEFT JOIN discussion_rating ON discussionA.thread_id = discussion_rating.thread_id 
  AND discussion_rating.post_id = discussion_posts.post_id 
WHERE 
  companies.company_id = 473

Query time 0.00095

JSON explain

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    "nested_loop": [
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          ],
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            "data_read_per_join": "14K"
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            "lang_code",
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            "city",
            "state",
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            "email",
            "phone",
            "url",
            "storefront",
            "secure_storefront",
            "entry_page",
            "redirect_customer",
            "countries_list",
            "timestamp",
            "shippings",
            "logos",
            "request_user_id",
            "request_account_name",
            "request_account_data",
            "plan_id",
            "stripe_connect_account_id",
            "identifier_facebook_pixel",
            "featured_products",
            "sd_ga_tracking_code",
            "paypal_commerce_platform_account_id",
            "tagline",
            "url_facebook",
            "url_instagram",
            "url_twitter",
            "url_pinterest",
            "announcement",
            "shippo_api_token",
            "shippo_carrier",
            "shippo_service_type",
            "vendor_ga_tracking_code",
            "vendor_fb_tracking_code",
            "custom_domain",
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            "taxjar_export_statuses",
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            "grace_period_start",
            "last_time_suspended",
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            "tax_number",
            "stripe_connect_account_type",
            "registered_from_storefront_id"
          ]
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      },
      {
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          "key": "PRIMARY",
          "used_key_parts": [
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          },
          "used_columns": [
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            "company_description",
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            "subdomain_colors",
            "i18n_company",
            "i18n_address",
            "i18n_city"
          ]
        }
      },
      {
        "table": {
          "table_name": "vendor_plan_descriptions",
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          },
          "used_columns": [
            "plan_id",
            "lang_code",
            "plan"
          ]
        }
      },
      {
        "table": {
          "table_name": "seo_names",
          "access_type": "ref",
          "possible_keys": [
            "PRIMARY",
            "dispatch"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
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            "lang_code"
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          ],
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          "cost_info": {
            "read_cost": "0.86",
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            "prefix_cost": "0.96",
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          },
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          ]
        }
      },
      {
        "table": {
          "table_name": "discussionA",
          "access_type": "const",
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            "object_id"
          ],
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            "const"
          ],
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            "object_type"
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      {
        "table": {
          "table_name": "discussion_posts",
          "access_type": "ref",
          "possible_keys": [
            "thread_id",
            "thread_id_2"
          ],
          "key": "thread_id_2",
          "used_key_parts": [
            "thread_id",
            "status"
          ],
          "key_length": "6",
          "ref": [
            "goimagine.discussionA.thread_id",
            "const"
          ],
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          "using_index": true,
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          },
          "used_columns": [
            "post_id",
            "thread_id",
            "status"
          ]
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      },
      {
        "table": {
          "table_name": "discussion_rating",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY",
            "thread_id"
          ],
          "key": "PRIMARY",
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          "key_length": "3",
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            "goimagine.discussion_posts.post_id"
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          "filtered": "100.00",
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          },
          "used_columns": [
            "rating_value",
            "post_id",
            "thread_id"
          ],
          "attached_condition": "<if>(is_not_null_compl(discussion_rating), (`goimagine`.`discussion_rating`.`thread_id` = `goimagine`.`discussionA`.`thread_id`), true)"
        }
      }
    ]
  }
}

Result

company_id lang_code company_description terms subdomain_colors i18n_company i18n_address i18n_city status company address city state country zipcode email phone url storefront secure_storefront entry_page redirect_customer countries_list timestamp shippings logos request_user_id request_account_name request_account_data plan_id stripe_connect_account_id identifier_facebook_pixel featured_products sd_ga_tracking_code paypal_commerce_platform_account_id tagline url_facebook url_instagram url_twitter url_pinterest announcement shippo_api_token shippo_carrier shippo_service_type vendor_ga_tracking_code vendor_fb_tracking_code custom_domain custom_domain_status taxjar_key taxjar_export_statuses taxjar_export_csv_data ag_hide_city updated_timestamp suspend_date grace_period_start last_time_suspended last_debt_notification_time tax_number stripe_connect_account_type registered_from_storefront_id plan seo_name seo_path average_rating company_thread_ids
473 en <p>Welcome to Twinkle Twinkle Tees. We are a handmade family apparel boutique specializing in pajamas for the whole family and designs for twins and triplets. Let us make something special for you!</p> <p><strong>Processing time</strong></p> <p>The time I need to prepare an order for shipping varies. For details, see individual items.</p> <p>Some items have a 3-5 day production time, but most have a 1-2 week production time.</p> <p><br><strong>Estimated shipping times</strong><br><span class="text-gray-lighter" data-region="estimate-display-name" data-value="north_america">North America:&nbsp;</span><span class="pl-xs-1">3-5 business days</span></p> <p><span class="text-gray-lighter" data-region="estimate-display-name" data-value="europe">Europe:&nbsp;</span><span class="pl-xs-1">2-3 weeks</span></p> <p>I'll do my best to meet these shipping estimates, but cannot guarantee them. Actual delivery time will depend on the shipping method you choose.</p> <p><strong><br>Customs and import taxes</strong><br>Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.</p> <p><br></p> <p><strong>Returns &&nbsp;Exchanges</strong><br></p> <p>I do not accept returns or exchanges on personalized or custom items. I do accept returns on non personalized/non custom items, but they must be received back in new condition.</p> {"tmenu_style":"V","default_colors":"N","link_color":"#007d89","label_color":"#007377","icon_color":"#007377","main_btn_color":"#6dd1d6","branded_text_color":"#007377","vbp_1_url":"","vbp_2_url":"","vbp_3_url":"","vba_1_url":"","vba_2_url":"","vba_3_url":""} Twinkle Twinkle Tees PO Box 1405 Snowflake A Twinkle Twinkle Tees PO Box 1405 Snowflake AZ US 85937 twinkletwinkletees@outlook.com none Y 1587833355 0 a:4:{s:14:"company_fields";a:2:{i:37;s:5:"Ailea";i:38;s:8:"Clarkson";}s:15:"admin_firstname";s:5:"Ailea";s:14:"admin_lastname";s:8:"Clarkson";s:6:"fields";a:0:{}} 3 acct_1GdqUXDzULlicd4v 21602,15947,17690 L89U9ZQTY7STY A {"items_per_file":"2500","time_from":"","time_to":""} N 0 0 0 0 0 S Professional Plan twinkletwinkletees 5.0000 473_3860