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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '36794c706b379cfe76e6c64a44f9c8dff43e03b6bae7cbf22c93562d4641edd3' 
  AND token = 'z/C36eYOI8DI707K22jBSpbTn1M8iICfvxA0DDCbML0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00852

JSON explain

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