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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '22b70dbac1a18baf1b66b486e6b8f17805a5e38849c08d5de1fdd0cb4908b23d' 
  AND token = 'XlT0ffI78KvIZrhUmUxTF9kRyVPQkpW8xE+ITJ1eA1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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