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 (
    85496, 85341, 85343, 89755, 89757, 91131, 
    91132, 91135, 91136, 91138, 91139, 
    91140, 91217, 91218, 91221, 91222, 
    91224, 91225, 91226, 91272, 91273, 
    91276, 91277, 91279, 91280, 91281, 
    89497, 89498, 89505, 89506, 89513, 
    89514, 89521, 89522, 91162, 91163, 
    91166, 91167, 91169, 91170, 91171, 
    89203, 89216, 89229, 86481, 86483, 
    86757, 86759, 82614, 82616, 83417, 
    83419, 85072, 85074, 85158, 85160, 
    85204, 85206, 85250, 85252, 83030, 
    83032, 83587, 83589, 90866, 90868, 
    90945, 90947, 85112, 85114, 86619, 
    86621, 86688, 86690, 83041, 83043, 
    90877, 90879, 90956, 90958, 86492, 
    86494, 86768, 86770, 85306, 85308, 
    85403, 85405, 85454, 85456, 85505, 
    85507, 91114, 91116, 91120, 91122
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00082

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 (85496,85341,85343,89755,89757,91131,91132,91135,91136,91138,91139,91140,91217,91218,91221,91222,91224,91225,91226,91272,91273,91276,91277,91279,91280,91281,89497,89498,89505,89506,89513,89514,89521,89522,91162,91163,91166,91167,91169,91170,91171,89203,89216,89229,86481,86483,86757,86759,82614,82616,83417,83419,85072,85074,85158,85160,85204,85206,85250,85252,83030,83032,83587,83589,90866,90868,90945,90947,85112,85114,86619,86621,86688,86690,83041,83043,90877,90879,90956,90958,86492,86494,86768,86770,85306,85308,85403,85405,85454,85456,85505,85507,91114,91116,91120,91122)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}