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 (
    91132, 91135, 91136, 91138, 91139, 91140, 
    91217, 91218, 91221, 91222, 91224, 
    91225, 91226, 91272, 91273, 91276, 
    91277, 91279, 91280, 91281, 83569, 
    83571, 90580, 90581, 90851, 90853, 
    90930, 90932, 89497, 89498, 89505, 
    89506, 89513, 89514, 89521, 89522, 
    91162, 91163, 91166, 91167, 91169, 
    91170, 91171, 83060, 84679, 84680, 
    84683, 84684, 90896, 90975, 84622, 
    84623, 89203, 89216, 89229, 84500, 
    84501, 84566, 84567, 84631, 84549, 
    84550, 84553, 84554, 84615, 84616, 
    84619, 84620, 84621, 86481, 86483, 
    86757, 86759, 90585, 90919, 90998, 
    85069, 85155, 85201, 85247, 82614, 
    82616, 83417, 83419, 84677, 84652, 
    84653, 91011, 91012, 91013, 91023, 
    91024, 91025, 91035, 91036, 91037
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00158

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 (91132,91135,91136,91138,91139,91140,91217,91218,91221,91222,91224,91225,91226,91272,91273,91276,91277,91279,91280,91281,83569,83571,90580,90581,90851,90853,90930,90932,89497,89498,89505,89506,89513,89514,89521,89522,91162,91163,91166,91167,91169,91170,91171,83060,84679,84680,84683,84684,90896,90975,84622,84623,89203,89216,89229,84500,84501,84566,84567,84631,84549,84550,84553,84554,84615,84616,84619,84620,84621,86481,86483,86757,86759,90585,90919,90998,85069,85155,85201,85247,82614,82616,83417,83419,84677,84652,84653,91011,91012,91013,91023,91024,91025,91035,91036,91037)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}