SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd437f6a58b0212a941e98c867835cce346fd0613336ca54784075b41b927d1dd' 
  AND token = 'V2RM8kGDz+JQJfNuoHu/w2vLQ2pz5koPiVNmhtiMtgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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