SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    551390, 552905, 552783, 552926, 551876, 
    552881, 552606, 552882, 551536, 551904
  )

Query time 0.00089

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": 10,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (551390,552905,552783,552926,551876,552881,552606,552882,551536,551904)"
    }
  }
}