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 (
    83938, 84082, 82497, 90169, 90174, 90175, 
    91472, 90206, 90217, 90193, 84050, 
    84058, 90226, 82495, 90237, 90242, 
    90253, 90261, 91471, 90186, 85961, 
    82498, 86856, 89547, 89533, 90252, 
    90260, 82493, 82435, 87375, 85606, 
    82496, 85610, 89539, 85605, 90251, 
    90259, 90279, 90287, 90176, 90192, 
    90309, 90236, 90241, 82494, 87372, 
    89543, 82487, 85960, 89532, 90235, 
    90240, 89540, 82492, 90225, 90183, 
    90234, 90239, 87371, 90224, 90199, 
    89546, 89538, 90173, 90308, 89554, 
    90223, 90278, 90286, 91481, 90198, 
    85620, 85634, 91480, 89544, 85618, 
    89542, 85616, 85619, 85633, 90222, 
    82491, 89563, 90221, 90197, 85617, 
    82490, 85615, 90205, 90216, 90220, 
    82489, 90191, 90277, 91478, 91885
  ) 
  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 (83938,84082,82497,90169,90174,90175,91472,90206,90217,90193,84050,84058,90226,82495,90237,90242,90253,90261,91471,90186,85961,82498,86856,89547,89533,90252,90260,82493,82435,87375,85606,82496,85610,89539,85605,90251,90259,90279,90287,90176,90192,90309,90236,90241,82494,87372,89543,82487,85960,89532,90235,90240,89540,82492,90225,90183,90234,90239,87371,90224,90199,89546,89538,90173,90308,89554,90223,90278,90286,91481,90198,85620,85634,91480,89544,85618,89542,85616,85619,85633,90222,82491,89563,90221,90197,85617,82490,85615,90205,90216,90220,82489,90191,90277,91478,91885)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}