Puede agregar un SET
cláusula al final de la consulta, por ejemplo,
LOAD DATA LOCAL INFILE 'C:/mydata.csv'
INSERT INTO TABLE myTable
FIELDS TERMINATED BY ','
OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY '\r\n'
IGNORE 1 LINES
(Column1,Column2,Column3,Column4)
SET datetime = NOW();