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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d8c8ee523e8adf3c24b48885d76c98991a9ea2622bb64a5fa7ad9253420c0f' 
  AND token = 'Bg41K4nMvV9y1M7WjRJmQbjIAS9O92ymrncouI2pbv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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