SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c4764f90094ba7a3021c80468d2836c8535b2ed5c82c2b92b1596ae99749d0bc' 
  AND token = 'raMTY7qRf/+lYz0SUCEX7zzdYe+ZFUdQ0W2OiO+VjnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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