Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63ad5762deb8d3528b9550136f2daec66ca600cebef5f02ad7920fbd37c3400' 
  AND token = 'H1bIL7NCKUQl7oZ4g9mMBtu5/5w9wIe1TCy1F9I8+Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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