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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400428699542ebbaee91050faf4ac242c7f5618b64b3502a7fa558ff6e085c43' 
  AND token = 'xetsNJFt8GpzA+In1TvUsd7LNVxzTOS4xAm9DzaTE4U=' 
  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"
    }
  }
}