Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '66e3fb5acdb92796b5568df0a4cb687a0a6014ff41a96002d518fd5ab444b0d4' 
  AND token = '4UyhUHCqhh4oel56kgp1jPmVeF8yE1KhJIA2LSQOjDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00760

JSON explain

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