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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd49d839a0490a6f7234474f24a326b4053d807094994a8016bb78c9d87417e74' 
  AND token = 'BKgEgVtui2Oeaxl2PCuEle0RhZbIOGeXM6mmEnfP548=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00766

JSON explain

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