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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f097e6e42010810bdb7923f7514dd08e20706919743b13a2a4496b198a914a8' 
  AND token = '0WcguDkH9ZkDABcyv69A5cE99eJ01a1B+B7rZqi6q4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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