Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670fbbdddd3e5f676fef7b96d28b8d98001da63a62cd70bc54eefb90037ebcdc' 
  AND token = 'W3lUnK5Rf9QXejAptJEXU9lBKwditmAlrm3Uzldjutg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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