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 (
    91627, 83923, 82422, 89379, 89394, 89396, 
    89343, 89385, 89375, 89376, 89381, 
    89289, 89390, 89392, 89344, 89382, 
    89388, 89380, 89395, 89397, 89410, 
    89411, 89412, 82423, 89341, 89290, 
    91945, 91946, 91947, 91948, 91949, 
    91950, 91951, 89360, 89286, 89387, 
    89342, 89363, 89377, 89365, 89359, 
    89288, 89386, 89383, 89297, 89362, 
    89364, 89378, 82371, 89296, 89391, 
    89393, 89406, 89408, 89407, 90843, 
    89302, 89384, 89389, 89300, 89301, 
    89299, 89349, 89350, 89263, 89340, 
    82450, 82451, 89339, 89353, 89354, 
    82449, 89355, 89356, 89284, 89293, 
    91944, 89291, 89262, 89285, 82353, 
    89292, 82352, 89287, 89357, 89358, 
    82386, 89402, 89404, 89403, 89295, 
    89294, 89405, 89257, 82385, 89345
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00206

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 (91627,83923,82422,89379,89394,89396,89343,89385,89375,89376,89381,89289,89390,89392,89344,89382,89388,89380,89395,89397,89410,89411,89412,82423,89341,89290,91945,91946,91947,91948,91949,91950,91951,89360,89286,89387,89342,89363,89377,89365,89359,89288,89386,89383,89297,89362,89364,89378,82371,89296,89391,89393,89406,89408,89407,90843,89302,89384,89389,89300,89301,89299,89349,89350,89263,89340,82450,82451,89339,89353,89354,82449,89355,89356,89284,89293,91944,89291,89262,89285,82353,89292,82352,89287,89357,89358,82386,89402,89404,89403,89295,89294,89405,89257,82385,89345)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}