Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8f181c9d6c86085c3f09ebbef3018747382d1eef8ce5b092d187fe51c45450' 
  AND token = 'LGKjKB1WVg8O6+HzuaU327J7SiJlRZQ73NjIHJoOWac=' 
  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"
    }
  }
}