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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '91788b174b91960885d7685ecb46f4a621a843dbb6b16561329ff9a8a68c915b' 
  AND token = 'qEFBYdDs/LpeDurrNiIeSokHV908mm1DdDY10cMi0wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00803

JSON explain

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