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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4ae4eb44cd3353a1732c3c63c731e3e299e78361f0264e8c74429fdb273bdfc9' 
  AND token = 'vzNR9t9yzYTlsVa7TMFv8zhEEJu1ZTRQv6uvdmEreKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00772

JSON explain

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