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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5ab0d8f084124c55cda71c17430ccc322d49598731c83e954b75d8500c11056b' 
  AND token = 'Tpy0mby/Ap6zzuAUE0aOKvDeWnVxx2i/c1HHhkQDGh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00953

JSON explain

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