Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c795a7595194d3e1bd0f63fbbb4975ccafbf32cd8c8d0f62e71f6a9a9d2c8c' 
  AND token = 'dLGQ0r9/AxeYgpWfoM/OL3El26ZGoRwRO/6ZCX79uQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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