SELECT 
  product_descriptions.product_id, 
  product_descriptions.short_description, 
  IF(
    product_descriptions.short_description = '' 
    OR product_descriptions.short_description IS NULL, 
    product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  product_descriptions 
WHERE 
  product_descriptions.product_id IN (
    77453, 77119, 77118, 77514, 77362, 77115, 
    77365, 77440, 77368, 77117, 77116, 
    77449, 77446, 77452
  ) 
  AND product_descriptions.lang_code = 'en'

Query time 0.00104

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "11.70"
    },
    "table": {
      "table_name": "product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "11",
      "rows_examined_per_scan": 14,
      "rows_produced_per_join": 14,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "10.30",
        "eval_cost": "1.40",
        "prefix_cost": "11.70",
        "data_read_per_join": "71K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`goimagine`.`product_descriptions`.`product_id` in (77453,77119,77118,77514,77362,77115,77365,77440,77368,77117,77116,77449,77446,77452)) and (`goimagine`.`product_descriptions`.`lang_code` = 'en'))"
    }
  }
}