SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10760, 10759, 10758, 10757, 10756, 10755, 
    10754, 10753, 10752, 10751, 10750, 
    10749, 10748, 10747, 15736, 15737, 
    15738, 15739, 15740, 15741
  )

Query time 0.00063

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 20,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (10760,10759,10758,10757,10756,10755,10754,10753,10752,10751,10750,10749,10748,10747,15736,15737,15738,15739,15740,15741)"
    }
  }
}