SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '62301fa8cb266973938b5a6cb54787574bb9050df1a83190bd808541df5bfd17' 
  AND token = '9WZZM8S6Fwly/o72vCFzGaphRQGHRNP+fQ8u/UHEyOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00762

JSON explain

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