Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_10 (grid INTEGER, time VARCHAR, laps VARCHAR, manufacturer VARCHAR)

### Question ###
What is the lowest Grid, when Laps is 21, when Manufacturer is Yamaha, and when Time is +18.802?

### Accurate SQL ###

SELECT MIN(grid) FROM table_name_10 WHERE laps = 21 AND manufacturer = "yamaha" AND time = "+18.802"