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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597ec0ff58c37bde4f540f7cc7b77b83fecf9508ec7e0afca52502c859e3b8e9' 
  AND token = 'QNdqPyVPe5swS+B/n6e3V85mTf8bhuAOYDSudpTDyQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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