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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f312454956bbd71f0da1072c73d381419df6bb339c219c75cf9a848e9ad74add' 
  AND token = 'QO7aB5tShmS61QQRjGDXxeRL1hxTVQz0W0LktKNXjP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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