SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '249354085d73005f57b12965b5794818d98d4d933fb386a5dc9136dd2c98ffef' 
  AND token = 'PFbkeBakKDzkHbWKaVzwY8YYJ2EQos5gf1pfC//qUsg=' 
  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"
    }
  }
}