SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    48959, 48951, 48948, 48949, 48950, 48946, 
    48947, 48942, 48941, 48939, 48938, 
    48869, 48870, 48871, 48872, 48873, 
    48856, 48857, 48858, 48859, 48860, 
    48861, 48862, 48863, 48864, 48865, 
    48866, 48867, 48868, 33723
  )

Query time 0.00208

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": 30,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (48959,48951,48948,48949,48950,48946,48947,48942,48941,48939,48938,48869,48870,48871,48872,48873,48856,48857,48858,48859,48860,48861,48862,48863,48864,48865,48866,48867,48868,33723)"
        }
      }
    ]
  }
}