SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5f0dbeb96ed099b232b95a252a77d62005598344a61ce03f11ca9139df9d7e' 
  AND token = 'TZEnYBs49UYHvl23xf72DVhK5quu+w0HqV+/Cv2cFmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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