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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ce01b07039e8b0fa793de9ba68a96861e8f261ba2b1ad3d770202843c8ab8ba' 
  AND token = '7OgFk9f/G8DzrbIuIz4v7CHojCLh0cGv4o8jEdgutcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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