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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6b2a0677cb8cb290ab3cedb9f0170c87334ec634e870e8732a1bccae13ccce2f' 
  AND token = '1UdNntTEVoKILfhnwdAy1vC9/wSYw/ZkdMSTobeuiV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00784

JSON explain

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