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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '8cf9733824fff06d35b6e8be4511c1c2bbfe4d4f72f1dc8b8e598807b0bb261a' 
  AND token = '5XfqIeA0D+8rTrwD9SxirBgeKU4K/9SE3CgkU4pTE1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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