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 (
    101305, 101306, 101307, 101308, 101309, 
    101310, 101311, 101312, 101313, 101314, 
    101315, 101316, 101317, 101318, 101319, 
    101320, 101321, 101322, 101323, 101324, 
    101325, 101326, 101327, 101328, 101329, 
    101330, 101331, 101332, 101333, 101334, 
    101335, 101336, 101337, 101338, 101339, 
    101340, 101341, 101342, 101343, 101344, 
    101345, 101346, 101347, 101348, 101349, 
    101350, 101351, 101352, 101353, 101354, 
    101355, 101356, 101357, 101358, 101359, 
    101360, 101361, 101362, 101363, 101364, 
    101365, 101366, 101367, 101368, 101369, 
    101370, 101371, 101372, 101373, 101374, 
    101375, 101376, 101377, 101378, 101379, 
    101380, 101381, 101382, 101383, 101384, 
    101385, 101386, 101387, 101388, 101389, 
    101390, 101391, 101392, 101393, 101394, 
    101395, 101396, 101397, 101398, 101399, 
    101400
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00181

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 (101305,101306,101307,101308,101309,101310,101311,101312,101313,101314,101315,101316,101317,101318,101319,101320,101321,101322,101323,101324,101325,101326,101327,101328,101329,101330,101331,101332,101333,101334,101335,101336,101337,101338,101339,101340,101341,101342,101343,101344,101345,101346,101347,101348,101349,101350,101351,101352,101353,101354,101355,101356,101357,101358,101359,101360,101361,101362,101363,101364,101365,101366,101367,101368,101369,101370,101371,101372,101373,101374,101375,101376,101377,101378,101379,101380,101381,101382,101383,101384,101385,101386,101387,101388,101389,101390,101391,101392,101393,101394,101395,101396,101397,101398,101399,101400)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}