Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46cd935984816871e4697bb7ac8d00f8addca332356a8430afa81abd442df46a' 
  AND token = 'KGwYIEYoFwLhRDDh4DdgCaG/EMbxVxM59kPlBYqy3DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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