SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    20910, 20914, 21748, 20700, 20702, 20703, 
    20917, 20704, 20705, 20706, 20707, 
    20708, 19857, 22994, 19858, 23288, 
    19859, 20486, 19860, 19820, 19863, 
    19865, 19866, 20154
  )

Query time 0.00107

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 24,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (20910,20914,21748,20700,20702,20703,20917,20704,20705,20706,20707,20708,19857,22994,19858,23288,19859,20486,19860,19820,19863,19865,19866,20154)"
        }
      }
    ]
  }
}