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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '009dc4f70e98ee2ce85ffadab8f4ef440fa768cc9b1b6fffe415fdd19e0facf2' 
  AND token = '0Cr2WMl6zowfSw+ch+5pD8xXImpp7uqxy/2+r0cuBow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00863

JSON explain

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