SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '76174f40f614e4e385091a13275d582095788fcfe89e9a1b4f5f51c5c8e96fb3' 
  AND token = 'u/gzqMW7u2SxvDKooNPamYgodYHY9cKVtY+Qzhz2yjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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