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 (
    100847, 100848, 100853, 100854, 100855, 
    100856, 100863, 100864, 100865, 100866, 
    100871, 100872, 100873, 100874, 100875, 
    100876, 100971, 100972, 100973, 100974, 
    100975, 100976, 100977, 100978, 100979, 
    100980, 100981, 100982, 100983, 100984, 
    100988, 101011, 101012, 101013, 101014, 
    101015, 101016, 101017, 101018, 101019, 
    101020, 101021, 101054, 101102, 101103, 
    101104, 101625, 101628, 101629, 101630, 
    101631, 101632, 101633, 101635, 101636, 
    101637, 101638, 101639, 101640, 101644, 
    101645, 101646, 101647, 101648, 101649, 
    101650, 101651, 101652, 101653, 101656, 
    101657, 101658, 101659, 101669, 101670, 
    101672, 101673, 101674, 101675, 101676, 
    101677, 101678, 101679, 101680, 101681, 
    101684, 101685, 101686, 101687, 101688, 
    101689, 101690, 101691, 101692, 101693, 
    101694
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00248

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 (100847,100848,100853,100854,100855,100856,100863,100864,100865,100866,100871,100872,100873,100874,100875,100876,100971,100972,100973,100974,100975,100976,100977,100978,100979,100980,100981,100982,100983,100984,100988,101011,101012,101013,101014,101015,101016,101017,101018,101019,101020,101021,101054,101102,101103,101104,101625,101628,101629,101630,101631,101632,101633,101635,101636,101637,101638,101639,101640,101644,101645,101646,101647,101648,101649,101650,101651,101652,101653,101656,101657,101658,101659,101669,101670,101672,101673,101674,101675,101676,101677,101678,101679,101680,101681,101684,101685,101686,101687,101688,101689,101690,101691,101692,101693,101694)) and (`nuie_scalesta_net`.`cscart_product_descriptions`.`lang_code` = 'en'))"
    }
  }
}