Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '248673072bf41f96e983d5d0cf493209c293015517d5c9d0337c7d68b0e0ef60' 
  AND token = '5R8j63aWh6FF2O65zxOA+m74uHSML+2c4I3NDQO9CVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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