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 (
    91372, 91374, 91371, 91373, 91370, 91381, 
    91383, 91369, 91368, 91379, 91382, 
    91384, 91351, 91353, 91367, 91377, 
    91380, 91349, 91352, 91354, 91378, 
    91347, 91350, 91348, 91361, 91363, 
    91391, 91393, 91362, 91364, 91392, 
    91394, 91359, 91389, 91360, 91357, 
    91387, 91358, 91390, 91388, 96213, 
    96214, 96215, 96216, 96217, 96218, 
    96219, 96220, 96221, 96222, 96223, 
    96224, 96225, 96226, 96227, 96228, 
    96229, 96230, 96231, 96232, 96233, 
    96234, 96235, 96236, 96237, 96238, 
    96239, 96240, 96241, 96242, 96243, 
    96244, 96334, 96336, 96338, 96340, 
    98722, 98723, 98724, 98725, 98726, 
    98727, 98728, 98729, 98730, 98731, 
    98732, 98733, 98734, 98735, 98736, 
    98737, 98750, 98751, 98752, 98753
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00243

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 (91372,91374,91371,91373,91370,91381,91383,91369,91368,91379,91382,91384,91351,91353,91367,91377,91380,91349,91352,91354,91378,91347,91350,91348,91361,91363,91391,91393,91362,91364,91392,91394,91359,91389,91360,91357,91387,91358,91390,91388,96213,96214,96215,96216,96217,96218,96219,96220,96221,96222,96223,96224,96225,96226,96227,96228,96229,96230,96231,96232,96233,96234,96235,96236,96237,96238,96239,96240,96241,96242,96243,96244,96334,96336,96338,96340,98722,98723,98724,98725,98726,98727,98728,98729,98730,98731,98732,98733,98734,98735,98736,98737,98750,98751,98752,98753)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}