SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    45574, 45816, 45817, 45818, 45819, 45820, 
    45821, 45822, 45823, 45824, 45825, 
    45826, 45827, 45828, 45829, 45830, 
    45831, 45832, 45833, 45834, 45835, 
    45836, 45837, 45838, 45839, 45840, 
    45841, 45842, 45843, 45844, 45845, 
    45846, 45847, 45848, 45849, 45850, 
    45851, 45852, 45853, 45854
  )

Query time 0.00118

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": 40,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (45574,45816,45817,45818,45819,45820,45821,45822,45823,45824,45825,45826,45827,45828,45829,45830,45831,45832,45833,45834,45835,45836,45837,45838,45839,45840,45841,45842,45843,45844,45845,45846,45847,45848,45849,45850,45851,45852,45853,45854)"
        }
      }
    ]
  }
}