SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4aca636bbe44d4096deaabd50e31e2170886f9f5f70bf8814ab5d2089f16cf97' 
  AND token = 'J1D3JtfK5/8XI/twVYRe5ZxKshq/KT0XpLJMeHmBmIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00977

JSON explain

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