disable1992

SELECT
    *
FROM
    (
        SELECT
        Table1.s1,
        Table1.date,
        Table1.t,
        (
        SELECT
           MIN(tbl.s1) AS s1
        FROM
           Table1 AS tbl
        WHERE 
            tbl.s1 > Table1.s1
        ) as NextId
    FROM
        Table1
) AS tblInner
JOIN Table1 AS Next
    ON tblInner.NextId=Next.s1
WHERE TIMESTAMPDIFF(SECOND,Next.date,tblInner.date)<tblInner.t