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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a4c7a1ad0768363543469a9431f51743d91e931fef34560e1bc00b8c8a2c24' 
  AND token = '6CYQhNmQcMH1m5doFsuv/+iVasgqrHbs4K/F3hGP6sk=' 
  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"
    }
  }
}