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 (
    89452, 89465, 89473, 89481, 85734, 89969, 
    90839, 90841, 91535, 87505, 87521, 
    88454, 88471, 88487, 88242, 88246, 
    89457, 89021, 88978, 88995, 87537, 
    88422, 89839, 89891, 89963, 91529, 
    84701, 88959, 88960, 88962, 88523, 
    87547, 88406, 88676, 88723, 88569, 
    85726, 85743, 85753, 85763, 85801, 
    85802, 87518, 87534, 88450, 88467, 
    88483, 85722
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00141

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 (89452,89465,89473,89481,85734,89969,90839,90841,91535,87505,87521,88454,88471,88487,88242,88246,89457,89021,88978,88995,87537,88422,89839,89891,89963,91529,84701,88959,88960,88962,88523,87547,88406,88676,88723,88569,85726,85743,85753,85763,85801,85802,87518,87534,88450,88467,88483,85722)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}