SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '029028b15db572f4afac78344ac31c3c6c914a7a04266b9f3bd6382f874f9b73' 
  AND token = 't3eHmy9SAwnNbK5JZ/mxEc+wjNhkk7s1C/z8m4RsZQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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