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 (
    91084, 91085, 86902, 86927, 86963, 86988, 
    87024, 87049, 87085, 87107, 83569, 
    83571, 90580, 90581, 90851, 90853, 
    90930, 90932, 90585, 90919, 90998, 
    91011, 91012, 91013, 91023, 91024, 
    91025, 91035, 91036, 91037, 91048, 
    91049, 91050, 89491, 89492, 89499, 
    89500, 89507, 89508, 89515, 89516, 
    83254, 83256, 83261, 83263, 90562, 
    90563, 90568, 90569, 90574, 90575, 
    91090, 91091, 91094, 91095, 91097, 
    91098, 91099, 91176, 91177, 91180, 
    91181, 91183, 91184, 91185, 91231, 
    91232, 91235, 91236, 91238, 91239, 
    91240, 83268, 83270, 90544, 90545, 
    91070, 91071, 91073, 91074, 91075, 
    90567, 90573, 90579, 87308, 87309, 
    87320, 87321, 87332, 87333, 87344, 
    87345, 90555, 90582, 90855, 90934
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00175

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "43.24"
    },
    "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": 96,
      "rows_produced_per_join": 96,
      "filtered": "100.00",
      "cost_info": {
        "read_cost": "33.64",
        "eval_cost": "9.60",
        "prefix_cost": "43.24",
        "data_read_per_join": "366K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ],
      "attached_condition": "((`nuie_scalesta_net`.`cscart_product_descriptions`.`product_id` in (91084,91085,86902,86927,86963,86988,87024,87049,87085,87107,83569,83571,90580,90581,90851,90853,90930,90932,90585,90919,90998,91011,91012,91013,91023,91024,91025,91035,91036,91037,91048,91049,91050,89491,89492,89499,89500,89507,89508,89515,89516,83254,83256,83261,83263,90562,90563,90568,90569,90574,90575,91090,91091,91094,91095,91097,91098,91099,91176,91177,91180,91181,91183,91184,91185,91231,91232,91235,91236,91238,91239,91240,83268,83270,90544,90545,91070,91071,91073,91074,91075,90567,90573,90579,87308,87309,87320,87321,87332,87333,87344,87345,90555,90582,90855,90934)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}