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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '330bf4272e350d5d398acc25e43e717f783ee1307a941017174c4fd127112ac3' 
  AND token = 'a1gu+/go5ELBI0z29qSK38K/DECtw6ZIuAEU/pT7UuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00845

JSON explain

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