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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '23637d96bd885c2801fca65c73aa2ffb597bc7f0275a8968510396e1432d54a3' 
  AND token = '2e6HrfhMvOar3a1Q3cdcKlLxt1cf9AnVlIVAw5nXNNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00769

JSON explain

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