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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62b0b3cd10f59a17aa93f2a43db6cd66a4d6230c825558a5fed789a69a085c0' 
  AND token = 'KGVtAvtzVT43a4qZ+lnTcBbh0BQG6pkQm60OkSrYcxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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