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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa21dc58c1f333a17ed5364cc89dc76b405ad97199da30a0d9518b828b587ef7' 
  AND token = 'lylh28hDiS/hXeM27LYk5UDl6TGc56eF3W0KIVihg/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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