SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5273a9586d8e5c07c798e953fc1627dd96131a10d9a0e405a3d0dd10cb293c9f' 
  AND token = 'Zf5vK2YqKSST66d3nv5+Ceg/FIhutz6V2H/viGhU/Pg=' 
  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"
    }
  }
}