Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ea159dcd709894471a50f86c616473bf0335a3b7e1d542cbd57770713533c9' 
  AND token = 'AHkR41a7kRqPqpGbeKPlNFF5gsIMl3H6NlPxeSqc7LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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