Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d1c8dd3b95b89ff70c281d102c4b2ac154e638ab4d1fe59d21337aee43d1eb' 
  AND token = 'lWiqJlkGn+abCY5drDl8WlDT82RO+pkhD4/q1uyXMns=' 
  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"
    }
  }
}