user: Question: What is the lowest grid with time of +0.499,when laps are larger than 21?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Marco Simoncelli', 'Gilera', 21.0, '40:19.910', 3.0]
SQL:

assistant: SELECT MIN("Grid") FROM "Table" WHERE "Time" = '+0.499' AND "Laps" > 21.0;