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 (
    91875, 85038, 92458, 92459, 92460, 92461, 
    92462, 92463, 92464, 92489, 92490, 
    92491, 92492, 92493, 92494, 92495, 
    86892, 92211, 92216, 92218, 92219, 
    92220, 92221, 92222, 92224, 92225, 
    92226, 92467, 92232, 92233, 92234, 
    92235, 92236, 92238, 92468, 92472, 
    92473, 92474, 92212, 92213, 92214, 
    92215, 92217, 92223, 92465, 92466, 
    92191, 92228, 92229, 92230, 92231, 
    92237, 92469, 92470, 92471, 85585, 
    91892, 92150, 92197, 92457, 92240, 
    92245, 92247, 92248, 92249, 92250, 
    92252, 92253, 92485, 92486, 92487, 
    85578, 92241, 92242, 92243, 92244, 
    92246, 92251, 92483, 92484, 92440, 
    92186, 92187, 92188, 92189, 92190, 
    92441, 85582, 92488, 92476, 92477, 
    92478, 92479, 92480, 92481, 92482
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00178

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 (91875,85038,92458,92459,92460,92461,92462,92463,92464,92489,92490,92491,92492,92493,92494,92495,86892,92211,92216,92218,92219,92220,92221,92222,92224,92225,92226,92467,92232,92233,92234,92235,92236,92238,92468,92472,92473,92474,92212,92213,92214,92215,92217,92223,92465,92466,92191,92228,92229,92230,92231,92237,92469,92470,92471,85585,91892,92150,92197,92457,92240,92245,92247,92248,92249,92250,92252,92253,92485,92486,92487,85578,92241,92242,92243,92244,92246,92251,92483,92484,92440,92186,92187,92188,92189,92190,92441,85582,92488,92476,92477,92478,92479,92480,92481,92482)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}