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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '908b5fc53c940a8c5c4ae9d451fdb1a7c96e0dd6d46df975d77b0a9ed62ada04' 
  AND token = 'SrYUgGaRMa1+ZS9i4yHio4CuqoeFwg7HE1rAxgt65b8=' 
  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"
    }
  }
}