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 (
    98197, 98198, 98199, 98208, 98209, 98210, 
    98211, 98212, 98213, 98214, 98215, 
    98216, 98217, 98218, 98219, 98220, 
    98221, 98222, 98223, 98322, 98323, 
    98538, 98539, 98540, 98541, 98542, 
    98543, 98544, 98545, 98546, 98547, 
    98548, 98549, 98563, 98564, 98565, 
    98566, 98567, 98568, 98569, 99519, 
    99520, 99521, 99522, 99523, 99524, 
    99525, 99526, 99527, 100971, 100972, 
    100973, 100974, 100975, 100976, 100977, 
    100978, 100979, 100980, 100981, 100982, 
    100983, 100984, 100988, 101102, 101103, 
    101104, 101628, 101629, 101630, 101631, 
    101632, 101633, 101678, 101679, 101680, 
    101681, 101740, 101741, 101742, 101743, 
    101854, 101855, 101856, 101857, 101858, 
    101859, 101860, 101861, 101862, 101863, 
    101864, 101865, 101866, 101867, 101868
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00171

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 (98197,98198,98199,98208,98209,98210,98211,98212,98213,98214,98215,98216,98217,98218,98219,98220,98221,98222,98223,98322,98323,98538,98539,98540,98541,98542,98543,98544,98545,98546,98547,98548,98549,98563,98564,98565,98566,98567,98568,98569,99519,99520,99521,99522,99523,99524,99525,99526,99527,100971,100972,100973,100974,100975,100976,100977,100978,100979,100980,100981,100982,100983,100984,100988,101102,101103,101104,101628,101629,101630,101631,101632,101633,101678,101679,101680,101681,101740,101741,101742,101743,101854,101855,101856,101857,101858,101859,101860,101861,101862,101863,101864,101865,101866,101867,101868)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}