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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e1ac39dd4c88b66e6ee9500301ac109aa16d066fd8ddc340aa351b2a8e5f72ef' 
  AND token = 'wUx0JA1KlwyXD1rc/SFYww283LkdZgdFEJ5DMF2fJqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00813

JSON explain

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