Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1f4ca6abb89ce56cafd06a5f7be246ed8f84d10652aa4553f6f5e9548efc43' 
  AND token = 'IX91zjCbNmRnZavcHkTqmdcUz9HHq1KIyuR3rBPsfcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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