SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '58bedbdb233e552dc850e066381f8c2aa66efcc09f74ef5a9e4b9c5ce5c6b3c9' 
  AND token = 'kliJpZXhhYL1j+5pCKozGsLjcy17nPnYjYQHmlrnnqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00799

JSON explain

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