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 (
    90889, 90891, 90968, 90970, 82631, 83528, 
    83050, 83595, 90886, 90965, 84820, 
    84821, 91168, 89768, 83051, 83600, 
    90887, 90966, 89821, 89873, 89945, 
    91511, 87306, 87307, 87318, 87319, 
    87330, 87331, 87342, 87343, 85063, 
    85149, 85195, 85241, 83564, 83565, 
    85060, 85146, 85192, 85238, 86134, 
    86136, 86157, 86159, 86642, 86644, 
    86711, 86713
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00154

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 (90889,90891,90968,90970,82631,83528,83050,83595,90886,90965,84820,84821,91168,89768,83051,83600,90887,90966,89821,89873,89945,91511,87306,87307,87318,87319,87330,87331,87342,87343,85063,85149,85195,85241,83564,83565,85060,85146,85192,85238,86134,86136,86157,86159,86642,86644,86711,86713)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}