SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d5d5c8478c21ca4d575535834b9f0d7c52e7e4d1bea4e2f890ef8301be69f7' 
  AND token = 'YluawT/jHkvnAX6qO+6G8JzhRuNPQUu/wddV+bOtKH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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