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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c6a003c951f360258bfdf87f5aa7e93f7338194050d527e745e93c7a150c85' 
  AND token = '5m+jGu/QVsiazymjMB+dgb4idksMB7AedDzuWBCEy8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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