Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f1bcf5bd9d9ccba98c5eb7310c27d1fdf9a1828fe3cbcfa0bd54511d6a2b37' 
  AND token = 'v0sfirPe8fUlpbB/l8SxEH85j0N0v6PPmvnQeX79Sq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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