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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ef4a1ccc24de148b36a08af17b1dc3faf4d940c0bc3f166afad6f79da28b24' 
  AND token = '39g6nXWxc1SAfseK6MuqSvG+DpgkT4yZaVWikR6OSBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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