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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c068044f02cf3ceefd0b475b6f1797060ddb403d4405b78f9f80e3d056813c1d' 
  AND token = 'nN2/HBk1bZCSk20n4fk0TfEadHrVIUR9d7dYyE8iT/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00893

JSON explain

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