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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72cdbd7351184a6452f78aff3fba3f7f76c5940a19e5eda931f2d3ae178d467e' 
  AND token = 'ARW2vg9Cu/3BEhNQoWeBzq6qkBbameNNEEYb0nKNl5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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