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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c30f55a5c0bb857dcea6a5a68a457c7c0d680f597f4bd36becb8db8a049e1b' 
  AND token = 'glzW8vYraOgvwhIWIJqtQvaZrtkAzn4eXs2uIrY7ztU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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