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 (
    100197, 100198, 100199, 100200, 100201, 
    100202, 100203, 100204, 100205, 100206, 
    100207, 100208, 100209, 100210, 100211, 
    100217, 100218, 100219, 100220, 100221, 
    100222, 100223, 100224, 100225, 100226, 
    100227, 100228, 100229, 100230, 100231, 
    100232, 100233, 100234, 100235, 100236, 
    100237, 100238, 100239, 100240, 100241, 
    100242, 100243, 100244, 100245, 100246, 
    100247, 100248, 100249, 100250, 100251, 
    100252, 100253, 100254, 100255, 100256, 
    100257, 100258, 100259, 100260, 100261, 
    100262, 100263, 100264, 100265, 100266, 
    100267, 100268, 100269, 100270, 100271, 
    100272, 100273, 100274, 100275, 100276, 
    100277, 100278, 100279, 100280, 100281, 
    100282, 100283, 100284, 100285, 100286, 
    100287, 100288, 100289, 100290, 100291, 
    100296, 100297, 100298, 100299, 100300, 
    100301
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00152

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 (100197,100198,100199,100200,100201,100202,100203,100204,100205,100206,100207,100208,100209,100210,100211,100217,100218,100219,100220,100221,100222,100223,100224,100225,100226,100227,100228,100229,100230,100231,100232,100233,100234,100235,100236,100237,100238,100239,100240,100241,100242,100243,100244,100245,100246,100247,100248,100249,100250,100251,100252,100253,100254,100255,100256,100257,100258,100259,100260,100261,100262,100263,100264,100265,100266,100267,100268,100269,100270,100271,100272,100273,100274,100275,100276,100277,100278,100279,100280,100281,100282,100283,100284,100285,100286,100287,100288,100289,100290,100291,100296,100297,100298,100299,100300,100301)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}