SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4874efd3386ff7e5fc7c4618f6e49b7d44ba971359191e54ffa6934c0894c5' 
  AND token = 'FZm4UMaRZJQ7+QGJqEz/hn7gYQaFRhy4OwmnqLAEZxc=' 
  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"
    }
  }
}