SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4c7c16da6a40202b047dff991070b577a2e8265026add6f85cbfb549389870' 
  AND token = 'gDuHHQyxl/H0zeSyfuKJN+u2BjWSCUuJw2WxK1yAD/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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