SELECT 
  * 
FROM 
  companies AS com 
  LEFT JOIN products AS prod ON com.company_id = prod.company_id 
WHERE 
  prod.product_id = 78550

Query time 0.00093

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.00"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "prod",
          "access_type": "const",
          "possible_keys": [
            "PRIMARY",
            "idx_company_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "ref": [
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.00",
            "eval_cost": "0.10",
            "prefix_cost": "0.00",
            "data_read_per_join": "4K"
          },
          "used_columns": [
            "product_id",
            "product_code",
            "product_type",
            "status",
            "company_id",
            "list_price",
            "amount",
            "weight",
            "length",
            "width",
            "height",
            "shipping_freight",
            "low_avail_limit",
            "timestamp",
            "updated_timestamp",
            "usergroup_ids",
            "is_edp",
            "edp_shipping",
            "unlimited_download",
            "tracking",
            "free_shipping",
            "zero_price_action",
            "is_pbp",
            "is_op",
            "is_oper",
            "is_returnable",
            "return_period",
            "avail_since",
            "out_of_stock_actions",
            "localization",
            "min_qty",
            "max_qty",
            "qty_step",
            "list_qty_count",
            "tax_ids",
            "age_verification",
            "age_limit",
            "options_type",
            "exceptions_type",
            "details_layout",
            "shipping_params",
            "weight_lbs",
            "weight_oz",
            "product_tax_code",
            "deleted_at",
            "archived_at",
            "position"
          ]
        }
      },
      {
        "table": {
          "table_name": "com",
          "access_type": "const",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "company_id"
          ],
          "key_length": "4",
          "ref": [
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 1,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "0.00",
            "eval_cost": "0.10",
            "prefix_cost": "0.00",
            "data_read_per_join": "14K"
          },
          "used_columns": [
            "company_id",
            "status",
            "company",
            "lang_code",
            "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"
          ]
        }
      }
    ]
  }
}

Result

company_id status company lang_code 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 product_id product_code product_type list_price amount weight length width height shipping_freight low_avail_limit usergroup_ids is_edp edp_shipping unlimited_download tracking free_shipping zero_price_action is_pbp is_op is_oper is_returnable return_period avail_since out_of_stock_actions localization min_qty max_qty qty_step list_qty_count tax_ids age_verification age_limit options_type exceptions_type details_layout shipping_params weight_lbs weight_oz product_tax_code deleted_at archived_at position
168 A Waverly Glass Works ~ Engraved Glassware en 1672 County Rd. 10 S. Alamosa CO US 81101 julieshomemadejems@gmail.com none Y 1618531111 0 a:4:{s:14:"company_fields";a:2:{i:37;s:5:"Julie";i:38;s:7:"Fransen";}s:15:"admin_firstname";s:5:"Julie";s:14:"admin_lastname";s:7:"Fransen";s:6:"fields";a:0:{}} 2 acct_1GQEp8GdqAQncn0o 87319,87318,87317,87315,87314,79541,87320,87322,87323,78483,78693,78691,78690,78689,78688,78687,78685,78551,78549,78550 https://www.facebook.com/JuliesHomemadeJems https://www.instagram.com/julieshomemadejems/ https://www.pinterest.com/julieshomemadejems/_created/ <p><span class="display-block">Welcome to my Shop. **PLEASE NOTE - My recipe pans are done in 2 different fonts. At this time, I DO NOT have the capability to do them in someones handwriting.</span></p> <p><span class="display-block"> ***I work very hard to produce a quality product. There are times however when things beyond my control can happen. Because of the handmade nature of my products, and the process I use, there can be some imperfections, such as missing the inside of letters. It will not change the readability of your product. Please embrace those imperfections when they happen and remember that you have a very unique product that is still beautiful.&nbsp;</span></p> <p><span class="display-block">Sand blasted baking pans, and coffee cups plus an assortment of gift items with excellent customer service and quick shipping are the focus of my shop. Custom orders are welcomed and encouraged. If you see an item that strikes your fancy, but you would like a different design, please contact me and I will do all I can to accommodate your request.</span></p> <p><span class="display-block"> I am happy to combine shipping Contact me before your purchase so shipping can be figured.</span></p> A N 1622849670 0 0 0 0 S 78550 P 15.00 2 1.000 0 0 0 2.00 0 0 N N N D N R N N N Y 10 0 N 0 0 0 0 N 0 P F a:5:{s:16:"min_items_in_box";i:0;s:16:"max_items_in_box";i:1;s:10:"box_length";i:6;s:9:"box_width";i:6;s:10:"box_height";i:6;} 1.000 0.000 2147483647