SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '61ffcfe0ce3c084e928353485112666e8e76ca60bf4236ceb9cae3e354b6d263' 
  AND token = 'RYqsDGCQjBvtWvHHBlKrGz4q+aCx6pJnsRk8gNhQV38=' 
  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"
    }
  }
}