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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9bcec8063e26b12c6ea4d00cee6250117034f33a5e4bdeace2691ee40db0d3f6' 
  AND token = 'iG3nFkFp1sbNUUG6D7rCEBOYKEQeiKJt8NRxqSawmj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00919

JSON explain

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