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, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    908, 3090, 2752, 1143, 2559, 2822, 2253, 
    2751, 2255, 2927, 2729, 3140, 1542, 
    3026, 853, 1540, 1544, 2736, 4887, 2251, 
    2252, 2254, 2869, 3174, 2877, 2788, 
    855, 2795, 5130, 2936, 2792, 3159, 3021, 
    3373, 3011, 2760, 3060, 2880, 2268, 
    3014, 3404, 3366, 3160, 3023, 3099, 
    2800, 2860, 3102, 2775, 2767, 2562, 
    3548, 5151, 2786, 3408, 3744, 2733, 
    3359, 5126, 5133, 2759, 5137, 3375, 
    3517, 5143, 8696, 8243, 8617, 8570, 
    8703, 7873, 7871, 7874, 9872, 10455, 
    8709, 8885, 7879, 8614, 8757
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00193

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "56.65"
    },
    "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": 80,
      "rows_produced_per_join": 80,
      "filtered": "100.00",
      "index_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`product_id` in (908,3090,2752,1143,2559,2822,2253,2751,2255,2927,2729,3140,1542,3026,853,1540,1544,2736,4887,2251,2252,2254,2869,3174,2877,2788,855,2795,5130,2936,2792,3159,3021,3373,3011,2760,3060,2880,2268,3014,3404,3366,3160,3023,3099,2800,2860,3102,2775,2767,2562,3548,5151,2786,3408,3744,2733,3359,5126,5133,2759,5137,3375,3517,5143,8696,8243,8617,8570,8703,7873,7871,7874,9872,10455,8709,8885,7879,8614,8757)) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "48.65",
        "eval_cost": "8.00",
        "prefix_cost": "56.65",
        "data_read_per_join": "365K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description",
        "unit_name"
      ]
    }
  }
}