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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '79e16240511179f9c23299e0bce7b626360b223d33b1e310b26571bf88c4c7bd' 
  AND token = 'IStNdbi4cSv1zJBHqctld9BuMQ1FmVdSudGX68Nm7uQ=' 
  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"
    }
  }
}