Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2268fcbe84eeaa3aaa1b601547be7e5c7e088927ab8ea06a7415ec9a3a9a2a5b' 
  AND token = 'rSD3qF5gctIKQo+N/XeIKZM7RMWgoo7E5/iQYQY+vm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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