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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5fe7751d475878dfb79e644edd6d094ec63ad5ce90ee7c319ec9680e9457a031' 
  AND token = 'gXSd1S2P33M2kPzn7M+uNOsWoxpUQSYQtHz/QY05Eus=' 
  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"
    }
  }
}