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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9def70f1ebee16ee43c8b690675565fa68d05996c82fb57812a274c20ca657dc' 
  AND token = '2pibcZ9XU0SXQb5OcCD/9Vzq7pswhIHQN1FYbia3c0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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