Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c207b1dceeb70d8d21aec94067713d9a9d21e9f37c507728c44ecdcd26da8925' 
  AND token = 'Fa+wKxHYYIttPfYMcuMxe5Ajn/aOoffzr//a3MC6DaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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