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 (
    88056, 88057, 88058, 87998, 88000, 88037, 
    90329, 90330, 90331, 90333, 90334, 
    90337, 90338, 90339, 90340, 90341, 
    90342, 90345, 90346, 90347, 90348, 
    87881, 88031, 87948, 88059, 88060, 
    88702, 88749, 89985, 87945, 89986, 
    88041, 86860, 87940, 87942, 87964, 
    90328, 90332, 90335, 90336, 90343, 
    90344, 88029, 88018, 88021, 88799, 
    88006, 88013
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00095

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 (88056,88057,88058,87998,88000,88037,90329,90330,90331,90333,90334,90337,90338,90339,90340,90341,90342,90345,90346,90347,90348,87881,88031,87948,88059,88060,88702,88749,89985,87945,89986,88041,86860,87940,87942,87964,90328,90332,90335,90336,90343,90344,88029,88018,88021,88799,88006,88013)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}