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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b912049a5d5ed715888452e470a61eaba20a7a50af39d20fb6718a81f452d805' 
  AND token = 'D1N8RHVCBCNKV7hiILs6b1jCjrhYF/oEpOKOWH5n7NQ=' 
  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"
    }
  }
}