Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac1d2dd7dff68af0b5bf3b77a7bd23b14cfecbf6aa2e185dfca38ad22e8c992' 
  AND token = 'CvUpaI7gHa6aE6Nc6YsBK3MF4TabWy1VRD41FCP9rHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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