SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '118157c8ba4c9c5354b5c892bc90975df73d15255127fe09e7e6b079b4dd2d68' 
  AND token = '4r+TqU017/IYDw6+JC/gkV5zZCja2Ah76fWOfzVGwQ8=' 
  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"
    }
  }
}