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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff620e1f90ca97ca541187098d0fab2b18d6950aa5bbe82f585a98c651f677a' 
  AND token = 'Klam9pWs+xnHURfLN6L+zrde5ZTK3mcmz9UBIn8C2sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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