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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '21e1207dc2006c8fa9d234e0d97eb3b31e12b47d21e1d7488e870d0600f77b26' 
  AND token = 'quKgFEVPDzx8WUjUmCY/RLOfR8ZDKlKoklwMpD8wwwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01483

JSON explain

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