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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9dada729e3d7b6e09a46c8ed00cdc7df94c16fff807a486b2162a5fbe45514' 
  AND token = '/fQ++u0ez1d+XzFytyuHm99delUvZO32KQihUrz+wT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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