Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8659c17b8864f3b675867e61294145e71f2c7ba6f7fc85523ce74607ed44c024' 
  AND token = 'IAJ3yJQDp7TMstGyJipBqa+AEB+iVrddArCrJ0N+OWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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