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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd657f3d2ce072fe3f3d46254d2048241c50fc9d001cfb6051d25a24ee8ab9e75' 
  AND token = 'FXVGxah3gQ+420HVc+RQ1LyGJqPn+Vi30SbiOoaQlv8=' 
  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"
    }
  }
}