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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd147af19de28c7dec1c90595447cea7d55b486f0db1b76bd9828221fd0dc5a39' 
  AND token = 'aUaxxg4rCBnvvWmtRf6ChlMOGqLm44qtHWWoLYuAOjU=' 
  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"
    }
  }
}