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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7d262cc176c650eca175988e1a3cef7959237695bfef6ca199e0de0fe6abc0d8' 
  AND token = '79eBPILS3weBPQ+HBC/zctluYmCTsjNmCw2bKPrV+CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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