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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '673854c5409e8cd039a27f504dc03e910e500179037bdf9b6b16e882a8cb8666' 
  AND token = 'jT+XKNkG0nQd4JgTNS8LI8pnpn888CPHBU+KGTwecbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01007

JSON explain

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