Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '12c0c3d40797914fb533d40f2d0bdc5ef1bd09805f24bd19e4619776495e6db6' 
  AND token = 'F/snivKrBC518S94RSbY+4I7ZTEp+nL5zhn9UlpPd4o=' 
  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"
    }
  }
}