Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9ae552b8299cae09a5ce0e1d78a0c693fbf8715099bd9c075a1ce9f0a9df937' 
  AND token = 'k7NRZ+spUxOB0dAnntkH6ZEBKlqV24/VZlTKZH/0VYE=' 
  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"
    }
  }
}