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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'dfa82dd1642d7cc4863a49a06a7340ab992c9d811ecad1c9f2316727a95ef81a' 
  AND token = 'tp9X8L6prNsYj12cRTOFtRNTY/NI4OlNSrz8T+6ZkCw=' 
  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"
    }
  }
}