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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5a5341f5fcb7d57f99864357ecc816563b83d035e17e0c3f9336207a31418a48' 
  AND token = '3xRMerTNgwGZ2TL3YNs19PPCE8PmVEenUKFrCdoBaE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00820

JSON explain

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