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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '680df631f24cb0f8c438c28e1a893d2f5600e300356e73d8c715c39905c10404' 
  AND token = '63dx9Z7DDXUmKU5m97Ksdr20OpG2RXW8uMTHitqrNRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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