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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c588c733503f90e36952a77bf662d8b7f65c67eb8499257a051a34ac83d04fcf' 
  AND token = '9NqMAyn9O05kjI0nIjeyseeKl1Q1iTVCZdAnwRn+lvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00933

JSON explain

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