SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    9984, 9985, 9986, 9987, 9988, 9989, 9990, 
    9991, 9992, 9993, 9994, 9995, 9996, 
    9997, 9998, 9999, 12995, 12996, 12997, 
    12998, 10734, 10735, 10736, 10737, 
    10738, 10747, 10748, 10749, 10750, 
    10751, 10752, 15744, 15745, 15746, 
    15743, 15738, 15739, 15740, 15741, 
    15742, 15736, 15737, 10668, 10669, 
    10670, 10671, 10672, 10673, 10674, 
    10675, 10676, 10677, 10678, 10679, 
    10680, 10681, 10682, 10683, 10684, 
    10685, 10686, 10607, 10608, 10609
  )

Query time 0.00134

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": 64,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (9984,9985,9986,9987,9988,9989,9990,9991,9992,9993,9994,9995,9996,9997,9998,9999,12995,12996,12997,12998,10734,10735,10736,10737,10738,10747,10748,10749,10750,10751,10752,15744,15745,15746,15743,15738,15739,15740,15741,15742,15736,15737,10668,10669,10670,10671,10672,10673,10674,10675,10676,10677,10678,10679,10680,10681,10682,10683,10684,10685,10686,10607,10608,10609)"
    }
  }
}