Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8dc57ff1068f7e0c94689031cbc7bcccbae000af9a7e0cd8bc3b26bfb5ee9d5' 
  AND token = 'iJY6whqZdQpdeE9QkAxe5IvLRHgNvD5c6TKTDlNt+zw=' 
  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"
    }
  }
}