SELECT 
  product_id, 
  short_description, 
  full_description 
FROM 
  q_product_descriptions 
WHERE 
  product_id IN (
    45390, 45397, 45412, 40679, 40680, 40681, 
    40682, 40683, 40684, 40685, 40686, 
    40687, 40688, 40689, 40690, 40691, 
    40692, 40693, 40694, 40695, 40696, 
    40697, 40698, 40699, 40700, 40702, 
    40703, 40704, 40705, 40706
  ) 
  AND lang_code = 'en'

Query time 0.00077

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "72.01"
    },
    "table": {
      "table_name": "q_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": 30,
      "rows_produced_per_join": 30,
      "filtered": "100.00",
      "index_condition": "((`portal`.`q_product_descriptions`.`product_id` in (45390,45397,45412,40679,40680,40681,40682,40683,40684,40685,40686,40687,40688,40689,40690,40691,40692,40693,40694,40695,40696,40697,40698,40699,40700,40702,40703,40704,40705,40706)) and (`portal`.`q_product_descriptions`.`lang_code` = 'en'))",
      "cost_info": {
        "read_cost": "66.01",
        "eval_cost": "6.00",
        "prefix_cost": "72.01",
        "data_read_per_join": "114K"
      },
      "used_columns": [
        "product_id",
        "lang_code",
        "short_description",
        "full_description"
      ]
    }
  }
}