Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a53fd8cdb2156afbeaca59f88eca86ab6024816bce47c269ea6b4e375e8cfe' 
  AND token = '/3Say4CN9QDQFCXxyVJaJkjDTrnZw32C+lYyNIhE8M0=' 
  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"
    }
  }
}