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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e11b2f399a0467a19bd9d6d44d581a1d7e823a218e2868d7d146a53ca5d4433e' 
  AND token = 'HwPS1pTu7gmtphMoZnTr0RgO/dLkfl/MlgyEX5Z/IAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00739

JSON explain

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