SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    88143, 88508, 87890, 84695, 88937, 87877, 
    87905, 88045, 88049, 87936, 88515, 
    88518, 88078, 88514, 88517, 88511, 
    88083, 87904, 90325, 87876, 88506, 
    88507, 88510, 88035, 88044, 87987, 
    90828, 90827, 87938, 87941, 87997, 
    88026, 87882, 87988, 88036, 88047, 
    88048, 90324, 90326, 88050, 88051, 
    88052, 88053, 88054, 87900, 87901, 
    87990, 87961
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00112

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.63"
    },
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": [
        "PRIMARY",
        "product_id"
      ],
      "key": "PRIMARY",
      "used_key_parts": [
        "product_id",
        "lang_code"
      ],
      "key_length": "9",
      "rows_examined_per_scan": 48,
      "rows_produced_per_join": 48,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "16.83",
        "eval_cost": "4.80",
        "prefix_cost": "21.63",
        "data_read_per_join": "183K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (88143,88508,87890,84695,88937,87877,87905,88045,88049,87936,88515,88518,88078,88514,88517,88511,88083,87904,90325,87876,88506,88507,88510,88035,88044,87987,90828,90827,87938,87941,87997,88026,87882,87988,88036,88047,88048,90324,90326,88050,88051,88052,88053,88054,87900,87901,87990,87961)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}