Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef7883e2a606b32d81e95b58fbbc810baa0904e45f18c21ccecab0d08f545df2' 
  AND token = 'WPLehU1zgV5feRhEkEDdIMmcKGWm9N5GV+u5uxEupDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}