CREATE TABLE table_45608 ("Rider" TEXT, "Manufacturer" TEXT, "Laps" FLOAT, "Time" TEXT, "Grid" FLOAT)

which grid did less than 20 laps in a time of +58.353?
SELECT MIN("Grid") FROM table_45608 WHERE "Time" = '+58.353' AND "Laps" < '20'
SELECT MIN("Grid") FROM "table_45608" WHERE "Laps" < '20' AND "Time" = '+58.353'