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 (
    82556, 85583, 89595, 89596, 89597, 82336, 
    91936, 91970, 91973, 91985, 91986, 
    91987, 91988, 91989, 91990, 91991, 
    91969, 91971, 91972, 91974, 91975, 
    86810, 82557, 84045, 82369, 82375, 
    82357, 89590, 89589, 86806, 82560, 
    82565, 82569, 82573, 82562, 82566, 
    82570, 91968, 84289, 82555, 82553, 
    82391, 82554, 82559, 82552, 82564, 
    82568, 82572
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00073

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "21.62"
    },
    "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": "16.82",
        "eval_cost": "4.80",
        "prefix_cost": "21.62",
        "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 (82556,85583,89595,89596,89597,82336,91936,91970,91973,91985,91986,91987,91988,91989,91990,91991,91969,91971,91972,91974,91975,86810,82557,84045,82369,82375,82357,89590,89589,86806,82560,82565,82569,82573,82562,82566,82570,91968,84289,82555,82553,82391,82554,82559,82552,82564,82568,82572)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}