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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9cc27c2aa6112a333dffccce5ff999382c15bf3a1b0bd5d428367dfd0c335f' 
  AND token = '+D6jBBP+y25qV42Paxg2A8WsLEC7kmqYgXOhNZ8RdLE=' 
  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"
    }
  }
}