Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064d3c86e2b6f0e78334d4b4f88e53767bceb20a902d287b9a5168cf9d88d4eb' 
  AND token = '/uUbcR0U1bFhiWVTbTzY9Tk0uRTinxicGKPN1flG0Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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