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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65fc8f2de6836cf9218bce5638b62eebfa1280df91afe2163d686b973e44f1ee' 
  AND token = '8DI4O3DCwkz+wIy7FxUiVxgj4kv1x0jwnJZ1c5Lxn1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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