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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9da6affefc26accd48c38b179f1932814017e7505d0ac2970b5407c92047f7d' 
  AND token = '876WDFl2RZitoD3i6K+9qNh9Gg3B0iE8DLDqZY/9EVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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