Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52493a13d746473076bf4ced96184fd0af3b2f80e2175f8b908535428ebd70f4' 
  AND token = 'IELcZm67uA5I30IK2aj3SWBon08SUcZ9Jxt25LKHSz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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