Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '756509eef841867799a1ff8c8ff7e06c8fb3dc302750c5a519346a6fa8120ecc' 
  AND token = 'jnsPBbD6KsfibB94HiJHQ71oEie8o5rbbtVyaXuatJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00768

JSON explain

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