SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db64db0624ccc00e445160a4b6b4891f03ede779b0171d8283b4dd3b4557849' 
  AND token = '+/7nmMZjuKloMXfGwKho2J/Dib33hn74p25l7Pv+O+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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