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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329fffed287d5e95a273f96ebb850f4df5baa7f934ec266806009023a9abd8a3' 
  AND token = 'gUswq6aK62kuiePnUnmLxbLOyr+lRewr4s2W7pddNwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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