Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4ece34763d4facdb6e6076f476cb7a48b233aeb513a071e95f27d6cfc50f1f' 
  AND token = '3D+Jrz36aSh9kz1RnwOXcykTn9lToXGmzg0TAh0f/Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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