SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    35279, 40350, 48823, 48839, 48836, 48837, 
    48826, 48827, 48828, 48829, 48830, 
    48831, 48832, 48833, 48834, 48835, 
    48843, 48844, 48845, 48846, 48847, 
    48848, 48849, 48850, 48851, 48852, 
    48812, 48813, 48814, 48815
  )

Query time 0.00097

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 (35279,40350,48823,48839,48836,48837,48826,48827,48828,48829,48830,48831,48832,48833,48834,48835,48843,48844,48845,48846,48847,48848,48849,48850,48851,48852,48812,48813,48814,48815)"
        }
      }
    ]
  }
}