Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4902e9aabddd27b6768f0c61132a540ae229b75ff281fa3cf5cd527a9ff4a485' 
  AND token = 'UbSrK8qeZfqzIny1rQ74bh6num1twQP2BZkJf2E9dUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}