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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '17d72f6d3ccb1dd35600d73543e17badc0844ffd0a06003289b742ccbcafbdd3' 
  AND token = '23XzdenEhfdKxMjvV6/UDinZiDGu1f/3JtvKAuoBcbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01002

JSON explain

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