Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfee4eb1a494defd6ec43843f93dec74aac96add7af56dafadc26671bdee6890' 
  AND token = 'a0EIVmWw2TkDkePb7pks9Hh/TMCbv35/QKntEGVq3Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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