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 (
    100302, 100303, 100304, 100305, 100306, 
    100307, 100308, 100309, 100310, 100311, 
    100312, 100313, 100314, 100315, 100316, 
    100317, 100318, 100319, 100320, 100327, 
    100328, 100329, 100330, 100331, 100332, 
    100333, 100334, 100335, 100336, 100337, 
    100338, 100339, 100340, 100341, 100342, 
    100343, 100344, 100345, 100346, 100347, 
    100348, 100349, 100350, 100351, 100352, 
    100353, 100354, 100355, 100356, 100357, 
    100359, 100360, 100438, 100439, 100440, 
    100441, 100442, 100443, 100444, 100445, 
    100446, 100447, 100448, 100449, 100450, 
    100451, 100452, 100453, 100454, 100455, 
    100456, 100457, 100458, 100459, 100460, 
    100461, 100462, 100463, 100464, 100465, 
    100466, 100467, 100468, 100469, 100470, 
    100471, 100472, 100473, 100474, 100475, 
    100476, 100928, 100929, 100944, 100945, 
    100948
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00172

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 (100302,100303,100304,100305,100306,100307,100308,100309,100310,100311,100312,100313,100314,100315,100316,100317,100318,100319,100320,100327,100328,100329,100330,100331,100332,100333,100334,100335,100336,100337,100338,100339,100340,100341,100342,100343,100344,100345,100346,100347,100348,100349,100350,100351,100352,100353,100354,100355,100356,100357,100359,100360,100438,100439,100440,100441,100442,100443,100444,100445,100446,100447,100448,100449,100450,100451,100452,100453,100454,100455,100456,100457,100458,100459,100460,100461,100462,100463,100464,100465,100466,100467,100468,100469,100470,100471,100472,100473,100474,100475,100476,100928,100929,100944,100945,100948)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}