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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c912256ac8a04f657fb66e37d476d7159a79e1e73bdaea56feb0f71f8c83e492' 
  AND token = 'mVwlUERAR1QshPOVshEb5fs6EEXGyMu9buwrGY6g6k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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