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 (
    90287, 90176, 90192, 90309, 90236, 90241, 
    85960, 90235, 90240, 90225, 90183, 
    90234, 90239, 90224, 90199, 90173, 
    90308, 90223, 90278, 90286, 90198, 
    90222, 90221, 90197, 90205, 90216, 
    90220, 90191, 90277, 91538, 91539, 
    90210, 90233, 91536, 91537, 90190, 
    90182, 90172, 90276, 90204, 90215, 
    90209, 90232, 90196, 90189, 94081, 
    94082, 94085, 94088, 94089, 94090, 
    94093, 94095, 94096, 94097, 94098, 
    94099, 94116, 94118, 96193, 96194, 
    100923, 100924, 100925, 100926, 100927, 
    100930, 100931, 100932, 100933, 100934, 
    100935, 100936, 100937, 100938, 100939, 
    100940, 100941, 100942, 100943, 100946, 
    100947, 100949, 100950, 100951, 100952, 
    100953, 100954, 100955, 100956, 100957, 
    100958, 100959, 100960, 100961, 100962
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00163

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 (90287,90176,90192,90309,90236,90241,85960,90235,90240,90225,90183,90234,90239,90224,90199,90173,90308,90223,90278,90286,90198,90222,90221,90197,90205,90216,90220,90191,90277,91538,91539,90210,90233,91536,91537,90190,90182,90172,90276,90204,90215,90209,90232,90196,90189,94081,94082,94085,94088,94089,94090,94093,94095,94096,94097,94098,94099,94116,94118,96193,96194,100923,100924,100925,100926,100927,100930,100931,100932,100933,100934,100935,100936,100937,100938,100939,100940,100941,100942,100943,100946,100947,100949,100950,100951,100952,100953,100954,100955,100956,100957,100958,100959,100960,100961,100962)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}