Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184f20e72255d28273dbb4e888b52f3f78da14832e26ed8cd877f92ac7b1faa7' 
  AND token = 'agZJiqp5ebs/0UhcghE19pNmnRGtc4Im18rLOxHcYBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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