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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'da446ac9eb7edeb5d968254862046d03c0a826bbf092fa3c4cef8e883d6c1efe' 
  AND token = 'RxM+pkJDSu7SH9EF/odabn1dj1tJ/EFKRuaT03bLmtE=' 
  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"
    }
  }
}