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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5af30267108ba0e0ca3c220a52ca15bf4387a6f1f5ad17d5bc0828639ce4a56' 
  AND token = '/W9kWGNPyc9HOipXtVeLfy76lxHNGjONl1QU3fxMXI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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