Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8be977db5a5c53294cdd2d827eb94504d4ea4e0a5c090433383cea720718dc' 
  AND token = '6uLlLi6e52ntPGI6nXxL1y8ZkT8JovadHU+HtlliJpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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