SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0899fd29edf3a473c24b5f9c43c583ebfbdbc6c9e5a11533c28497e28751f4' 
  AND token = 'CfnmcIXgvS9DsHVYvPjonP3zT9hkkH2ZuBd3HB8WDBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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