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 (
    89387, 89342, 89363, 89377, 89365, 82354, 
    89359, 86235, 89435, 89288, 89386, 
    89383, 89297, 82417, 86852, 89362, 
    89364, 91921, 91922, 91923, 91924, 
    91925, 91926, 91927, 91929, 91930, 
    91931, 91932, 91933, 91934, 91935, 
    89378, 82371, 89433, 89434, 89296, 
    89391, 89393, 89406, 89408, 89407, 
    90843, 82421, 89441, 89302, 82399, 
    86848, 82414
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00094

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 (89387,89342,89363,89377,89365,82354,89359,86235,89435,89288,89386,89383,89297,82417,86852,89362,89364,91921,91922,91923,91924,91925,91926,91927,91929,91930,91931,91932,91933,91934,91935,89378,82371,89433,89434,89296,89391,89393,89406,89408,89407,90843,82421,89441,89302,82399,86848,82414)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}