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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ae26fe73ef30628f15dcddc86cb7521d5ce5a7c2240afcb82b7bee0c50f55a28' 
  AND token = 'y2oPZZEjhm8od61YqLE7hJO5iP+85K+ta2r8EAFj7g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00787

JSON explain

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