Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a966a670d782820b464dca136dc12580ca6eb61dcdbe9dc8a253dbf28a903c' 
  AND token = 'a5dDwQZ7NWDhchGN9juKNmoYHLygoyLJ1+eg5NwDNz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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