Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6131ed51dc56c9aa42d925c7fbaaf3c907ec225cf28bd85ac077bba325291b4a' 
  AND token = 'uSxEnlZNXHiEfc6otkZ2E5cIQQ6SE7s+IrUBKcpXk/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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