Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebfe16ab2e3b4f1dec69e5006f313097076177e0c4f3d5536e1c3be6ba04fc17' 
  AND token = 'sg5NzXqz8NvsjJOx5zA9fT5hr4wGfOPJfzCSCVilmZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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