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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '481743bb218e88925232f6fdee6817d81d14964906bbc860bd7e215209d7faa3' 
  AND token = 'rs+E54H0dxYTqTxjMLaA/TnMkMeJMH7yZ4kgwHKY2jc=' 
  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"
    }
  }
}