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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ca3c329070ba0a9efdbba8c68b27eed5b4d77fe3895a7772c8bbea37a6e925' 
  AND token = 'SFo9yiNj7NnJHFqKQ28IwciXu6XFnkrlP7bFK1sTe7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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