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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4b808a1cde42def38a8375f63ab47c2f472b9219fcb1392af46186134d2ab6' 
  AND token = '/9G9PfMNpJlRIh/YIj6JXlwWHbU8NzOMSPepODn7IzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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