SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ccd7b7999e3ac5ba2d16ca99db7109f5e95d5b82e5b3e67c8afee2186c124c12' 
  AND token = '6O/B+jnaq8cVnOy4GTQZw3V9UzaLX0ZLh28Qw6gUZCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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