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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179bf6ef65dec0515c2785d8e9be603e39bd4190ec7fabe5a95a8644b5a31c27' 
  AND token = 'wfKql5ew4ftJT68VTUI4XtXK7s3NKzT9I2jNb6iOAxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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