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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66a3410dd1581a2f3ec1a79e02d4d50e2967286902ae5a9ed15741adfbae31d' 
  AND token = 'f31RyGfHfCn3jqI+HhwoIl1uS5/buC23SGZdVs5ghpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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